Visible crew/equipment: When Doug says he's not on board with the plan, the camera pans back just a bit too far, and the stage lights appear in the top of the screen. (00:18:40)
Continuity mistake: When Carrie is reading from the leaflet, the way she holds it changes depending on the shot. (00:17:35)





Answer: Sara hasn't been mentioned in later episodes, and it suggested in later episodes that she never existed, and that Carrie is an only child. Kevin James stated that the producers couldn't think of an good plots to use with Sara, so they left her out.